dhcpservice/dhcpservice-impl/src/main/java/org/opendaylight/vpnservice/dhcpservice/DhcpPktHandler.java

   1 /*
   2  * Copyright (c) 2015 Ericsson India Global Services Pvt Ltd. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.vpnservice.dhcpservice;
   9
  10 import java.io.ByteArrayOutputStream;
  11 import java.io.IOException;
  12 import java.math.BigInteger;
  13 import java.net.InetAddress;
  14 import java.net.UnknownHostException;
  15 import java.util.Arrays;
  16 import java.util.Iterator;
  17 import java.util.List;
  18 import java.util.concurrent.ExecutionException;
  19 import java.util.concurrent.Future;
  20
  21 import org.apache.commons.lang3.tuple.ImmutablePair;
  22 import org.apache.commons.net.util.SubnetUtils;
  23 import org.apache.commons.net.util.SubnetUtils.SubnetInfo;
  24 import org.opendaylight.controller.liblldp.EtherTypes;
  25 import org.opendaylight.controller.liblldp.NetUtils;
  26 import org.opendaylight.controller.liblldp.PacketException;
  27 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  28 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  29 import org.opendaylight.vpnservice.dhcpservice.api.DHCP;
  30 import org.opendaylight.vpnservice.dhcpservice.api.DHCPConstants;
  31 import org.opendaylight.vpnservice.dhcpservice.api.DHCPMConstants;
  32 import org.opendaylight.vpnservice.dhcpservice.api.DHCPUtils;
  33 import org.opendaylight.vpnservice.mdsalutil.MDSALUtil;
  34 import org.opendaylight.vpnservice.mdsalutil.MetaDataUtil;
  35 import org.opendaylight.vpnservice.mdsalutil.NwConstants;
  36 import org.opendaylight.vpnservice.mdsalutil.packet.Ethernet;
  37 import org.opendaylight.vpnservice.mdsalutil.packet.IEEE8021Q;
  38 import org.opendaylight.vpnservice.mdsalutil.packet.IPProtocols;
  39 import org.opendaylight.vpnservice.mdsalutil.packet.IPv4;
  40 import org.opendaylight.vpnservice.mdsalutil.packet.UDP;
  41 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.IpAddress;
  42 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.InterfacesState;
  43 import org.opendaylight.yang.gen.v1.urn.opendaylight.action.types.rev131112.action.list.Action;
  44 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.NodeConnectorId;
  45 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.ports.rev150712.ports.attributes.ports.Port;
  46 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.subnets.rev150712.subnet.attributes.HostRoutes;
  47 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.subnets.rev150712.subnets.attributes.subnets.Subnet;
  48 import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.service.rev130709.PacketInReason;
  49 import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.service.rev130709.PacketProcessingListener;
  50 import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.service.rev130709.PacketProcessingService;
  51 import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.service.rev130709.PacketReceived;
  52 import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.service.rev130709.SendToController;
  53 import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.service.rev130709.TransmitPacketInput;
  54 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.interfacemgr.rpcs.rev151003.GetEgressActionsForInterfaceInputBuilder;
  55 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.interfacemgr.rpcs.rev151003.GetEgressActionsForInterfaceOutput;
  56 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.interfacemgr.rpcs.rev151003.GetInterfaceFromIfIndexInput;
  57 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.interfacemgr.rpcs.rev151003.GetInterfaceFromIfIndexInputBuilder;
  58 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.interfacemgr.rpcs.rev151003.GetInterfaceFromIfIndexOutput;
  59 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.interfacemgr.rpcs.rev151003.OdlInterfaceRpcService;
  60 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  61 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier.InstanceIdentifierBuilder;
  62 import org.opendaylight.yangtools.yang.common.RpcResult;
  63 import org.slf4j.Logger;
  64 import org.slf4j.LoggerFactory;
  65
  66 import com.google.common.base.Optional;
  67
  68 public class DhcpPktHandler implements AutoCloseable, PacketProcessingListener {
  69
  70     private static final Logger LOG = LoggerFactory.getLogger(DhcpPktHandler.class);
  71     private final DataBroker dataBroker;
  72     private final DhcpManager dhcpMgr;
  73     private OdlInterfaceRpcService interfaceManagerRpc;
  74     private boolean computeUdpChecksum = true;
  75     private PacketProcessingService pktService;
  76     private DhcpExternalTunnelManager dhcpExternalTunnelManager;
  77
  78     public DhcpPktHandler(final DataBroker broker, final DhcpManager dhcpManager, final DhcpExternalTunnelManager dhcpExternalTunnelManager) {
  79         this.dhcpExternalTunnelManager = dhcpExternalTunnelManager;
  80         this.dataBroker = broker;
  81         dhcpMgr = dhcpManager;
  82     }
  83
  84     //TODO: Handle this in a separate thread
  85     @Override
  86     public void onPacketReceived(PacketReceived packet) {
  87         Class<? extends PacketInReason> pktInReason = packet.getPacketInReason();
  88         if (isPktInReasonSendtoCtrl(pktInReason)) {
  89             byte[] inPayload = packet.getPayload();
  90             Ethernet ethPkt = new Ethernet();
  91             try {
  92                 ethPkt.deserialize(inPayload, 0, inPayload.length * NetUtils.NumBitsInAByte);
  93             } catch (Exception e) {
  94                 LOG.warn("Failed to decode DHCP Packet {}", e);
  95                 LOG.trace("Received packet {}", packet);
  96                 return;
  97             }
  98             try {
  99                 DHCP pktIn;
 100                 pktIn = getDhcpPktIn(ethPkt);
 101                 if (pktIn != null) {
 102                     LOG.trace("DHCPPkt received: {}", pktIn);
 103                     LOG.trace("Received Packet: {}", packet);
 104                     BigInteger metadata = packet.getMatch().getMetadata().getMetadata();
 105                     long portTag = MetaDataUtil.getLportFromMetadata(metadata).intValue();
 106                     String macAddress = DHCPUtils.byteArrayToString(ethPkt.getSourceMACAddress());
 107                     BigInteger tunnelId = packet.getMatch().getTunnel() == null ? null : packet.getMatch().getTunnel().getTunnelId();
 108                     String interfaceName = getInterfaceNameFromTag(portTag);
 109                     ImmutablePair<BigInteger, String> pair = getDpnIdPhysicalAddressFromInterfaceName(interfaceName);
 110                     DHCP replyPkt = handleDhcpPacket(pktIn, interfaceName, macAddress, tunnelId);
 111                     byte[] pktOut = getDhcpPacketOut(replyPkt, ethPkt, pair.getRight());
 112                     sendPacketOut(pktOut, pair.getLeft(), interfaceName, tunnelId);
 113                 }
 114             } catch (Exception e) {
 115                 LOG.warn("Failed to get DHCP Reply");
 116                 LOG.trace("Reason for failure {}", e);
 117             }
 118         }
 119     }
 120
 121     private void sendPacketOut(byte[] pktOut, BigInteger dpnId, String interfaceName, BigInteger tunnelId) {
 122         LOG.trace("Sending packet out DpId {}, portId {}, vlanId {}, interfaceName {}", dpnId, interfaceName);
 123         List<Action> action = getEgressAction(interfaceName, tunnelId);
 124         TransmitPacketInput output = MDSALUtil.getPacketOut(action, pktOut, dpnId);
 125         LOG.trace("Transmitting packet: {}",output);
 126         this.pktService.transmitPacket(output);
 127     }
 128
 129     private DHCP handleDhcpPacket(DHCP dhcpPkt, String interfaceName, String macAddress, BigInteger tunnelId) {
 130         LOG.debug("DHCP pkt rcvd {}", dhcpPkt);
 131         byte msgType = dhcpPkt.getMsgType();
 132         if (msgType == DHCPConstants.MSG_DECLINE) {
 133             LOG.debug("DHCPDECLINE received");
 134             return null;
 135         } else if (msgType == DHCPConstants.MSG_RELEASE) {
 136             LOG.debug("DHCPRELEASE received");
 137             return null;
 138         }
 139         Port nPort;
 140         if (tunnelId != null) {
 141             nPort = dhcpExternalTunnelManager.readVniMacToPortCache(tunnelId, macAddress);
 142         } else {
 143             nPort = getNeutronPort(interfaceName);
 144         }
 145         Subnet nSubnet = getNeutronSubnet(nPort);
 146         DhcpInfo dhcpInfo = getDhcpInfo(nPort, nSubnet);
 147         LOG.trace("NeutronPort: {} \n NeutronSubnet: {}, dhcpInfo{}",nPort, nSubnet, dhcpInfo);
 148         DHCP reply = null;
 149         if (dhcpInfo != null) {
 150             if (msgType == DHCPConstants.MSG_DISCOVER) {
 151                 reply = getReplyToDiscover(dhcpPkt, dhcpInfo);
 152             } else if (msgType == DHCPConstants.MSG_REQUEST) {
 153                 reply = getReplyToRequest(dhcpPkt, dhcpInfo);
 154             }
 155         }
 156
 157         return reply;
 158     }
 159
 160     private DhcpInfo getDhcpInfo(Port nPort, Subnet nSubnet) {
 161         DhcpInfo dhcpInfo = null;
 162         if( (nPort != null) && (nSubnet != null) ) {
 163             String clientIp = nPort.getFixedIps().get(0).getIpAddress().getIpv4Address().getValue();
 164             String serverIp = nSubnet.getGatewayIp().getIpv4Address().getValue();
 165             List<IpAddress> dnsServers = nSubnet.getDnsNameservers();
 166             dhcpInfo = new DhcpInfo();
 167             dhcpInfo.setClientIp(clientIp).setServerIp(serverIp)
 168                 .setCidr(nSubnet.getCidr()).setHostRoutes(nSubnet.getHostRoutes())
 169                 .setDnsServersIpAddrs(dnsServers).setGatewayIp(serverIp);
 170         }
 171         return dhcpInfo;
 172     }
 173
 174     private Subnet getNeutronSubnet(Port nPort) {
 175         return dhcpMgr.getNeutronSubnet(nPort);
 176     }
 177
 178     private Port getNeutronPort(String interfaceName) {
 179             return dhcpMgr.getNeutronPort(interfaceName);
 180     }
 181
 182     private DHCP getDhcpPktIn(Ethernet actualEthernetPacket) {
 183         Ethernet ethPkt = actualEthernetPacket;
 184         if (ethPkt.getEtherType() == (short)NwConstants.ETHTYPE_802_1Q) {
 185             ethPkt = (Ethernet)ethPkt.getPayload();
 186         }
 187         if (ethPkt.getPayload() instanceof IPv4) {
 188             IPv4 ipPkt = (IPv4) ethPkt.getPayload();
 189             if (ipPkt.getPayload() instanceof UDP) {
 190                 UDP udpPkt = (UDP) ipPkt.getPayload();
 191                 if ((udpPkt.getSourcePort() == DHCPMConstants.dhcpClientPort)
 192                         && (udpPkt.getDestinationPort() == DHCPMConstants.dhcpServerPort)) {
 193                     LOG.trace("Matched dhcpClientPort and dhcpServerPort");
 194                     byte[] rawDhcpPayload = udpPkt.getRawPayload();
 195                     DHCP reply = new DHCP();
 196                     try {
 197                         reply.deserialize(rawDhcpPayload, 0, rawDhcpPayload.length);
 198                     } catch (PacketException e) {
 199                         LOG.warn("Failed to deserialize DHCP pkt");
 200                         LOG.trace("Reason for failure {}", e);
 201                         return null;
 202                     }
 203                     return reply;
 204                 }
 205             }
 206         }
 207         return null;
 208     }
 209
 210     DHCP getReplyToDiscover(DHCP dhcpPkt, DhcpInfo dhcpInfo) {
 211         DHCP reply = new DHCP();
 212         reply.setOp(DHCPConstants.BOOTREPLY);
 213         reply.setHtype(dhcpPkt.getHtype());
 214         reply.setHlen(dhcpPkt.getHlen());
 215         reply.setHops((byte) 0);
 216         reply.setXid(dhcpPkt.getXid());
 217         reply.setSecs((short) 0);
 218
 219         reply.setYiaddr(dhcpInfo.getClientIp());
 220         reply.setSiaddr(dhcpInfo.getServerIp());
 221
 222         reply.setFlags(dhcpPkt.getFlags());
 223         reply.setGiaddr(dhcpPkt.getGiaddr());
 224         reply.setChaddr(dhcpPkt.getChaddr());
 225
 226         reply.setMsgType(DHCPConstants.MSG_OFFER);
 227         if(dhcpPkt.containsOption(DHCPConstants.OPT_PARAMETER_REQUEST_LIST)) {
 228             setParameterListOptions(dhcpPkt, reply, dhcpInfo);
 229         }
 230         setCommonOptions(reply, dhcpInfo);
 231         return reply;
 232     }
 233
 234     DHCP getReplyToRequest(DHCP dhcpPkt, DhcpInfo dhcpInfo) {
 235         boolean sendAck = false;
 236         byte[] requestedIp = null;
 237         DHCP reply = new DHCP();
 238         reply.setOp(DHCPConstants.BOOTREPLY);
 239         reply.setHtype(dhcpPkt.getHtype());
 240         reply.setHlen(dhcpPkt.getHlen());
 241         reply.setHops((byte) 0);
 242         reply.setXid(dhcpPkt.getXid());
 243         reply.setSecs((short) 0);
 244
 245         reply.setFlags(dhcpPkt.getFlags());
 246         reply.setGiaddr(dhcpPkt.getGiaddr());
 247         reply.setChaddr(dhcpPkt.getChaddr());
 248         byte[] allocatedIp = DHCPUtils.strAddrToByteArray(dhcpInfo.getClientIp());
 249         if(Arrays.equals(allocatedIp, dhcpPkt.getCiaddr())) {
 250             //This means a renew request
 251             sendAck = true;
 252         } else {
 253             requestedIp = dhcpPkt.getOptionBytes(DHCPConstants.OPT_REQUESTED_ADDRESS);
 254             sendAck = Arrays.equals(allocatedIp, requestedIp);
 255         }
 256
 257         if (sendAck) {
 258             reply.setCiaddr(dhcpPkt.getCiaddr());
 259             reply.setYiaddr(dhcpInfo.getClientIp());
 260             reply.setSiaddr(dhcpInfo.getServerIp());
 261             reply.setMsgType(DHCPConstants.MSG_ACK);
 262             if(dhcpPkt.containsOption(DHCPConstants.OPT_PARAMETER_REQUEST_LIST)) {
 263                 setParameterListOptions(dhcpPkt, reply, dhcpInfo);
 264             }
 265             setCommonOptions(reply, dhcpInfo);
 266         }
 267         else {
 268             reply.setMsgType(DHCPConstants.MSG_NAK);
 269         }
 270         return reply;
 271     }
 272
 273     protected byte[] getDhcpPacketOut(DHCP reply, Ethernet etherPkt, String phyAddrees) {
 274         if (reply == null) {
 275             /*
 276              * DECLINE or RELEASE don't result in reply packet
 277              */
 278             return null;
 279         }
 280         LOG.debug("Sending DHCP Pkt {}", reply);
 281         // create UDP pkt
 282         UDP udpPkt = new UDP();
 283         byte[] rawPkt;
 284         try {
 285             rawPkt = reply.serialize();
 286         } catch (PacketException e2) {
 287             // TODO Auto-generated catch block
 288             e2.printStackTrace();
 289             return null;
 290         }
 291         udpPkt.setRawPayload(rawPkt);
 292         udpPkt.setDestinationPort(DHCPMConstants.dhcpClientPort);
 293         udpPkt.setSourcePort(DHCPMConstants.dhcpServerPort);
 294         udpPkt.setLength((short) (rawPkt.length + 8));
 295         //Create IP Pkt
 296         IPv4 ip4Reply = new IPv4();
 297         try {
 298             rawPkt = udpPkt.serialize();
 299         } catch (PacketException e) {
 300             // TODO Auto-generated catch block
 301             e.printStackTrace();
 302             return null;
 303         }
 304         short checkSum = 0;
 305         if(this.computeUdpChecksum) {
 306          checkSum = computeChecksum(rawPkt, reply.getSiaddr(),
 307                 NetUtils.intToByteArray4(DHCPMConstants.BCAST_IP));
 308         }
 309         udpPkt.setChecksum(checkSum);
 310         ip4Reply.setPayload(udpPkt);
 311         ip4Reply.setProtocol(IPProtocols.UDP.byteValue());
 312         ip4Reply.setSourceAddress(reply.getSiaddrAsInetAddr());
 313         ip4Reply.setDestinationAddress(DHCPMConstants.BCAST_IP);
 314         ip4Reply.setTotalLength((short) (rawPkt.length+20));
 315         ip4Reply.setTtl((byte) 32);
 316         // create Ethernet Frame
 317         Ethernet ether = new Ethernet();
 318         if (etherPkt.getEtherType() == (short)NwConstants.ETHTYPE_802_1Q) {
 319             IEEE8021Q vlanPacket = (IEEE8021Q) etherPkt.getPayload();
 320             IEEE8021Q vlanTagged = new IEEE8021Q();
 321             vlanTagged.setCFI(vlanPacket.getCfi());
 322             vlanTagged.setPriority(vlanPacket.getPriority());
 323             vlanTagged.setVlanId(vlanPacket.getVlanId());
 324             vlanTagged.setPayload(ip4Reply);
 325             vlanTagged.setEtherType(EtherTypes.IPv4.shortValue());
 326             ether.setPayload(vlanTagged);
 327             ether.setEtherType((short) NwConstants.ETHTYPE_802_1Q);
 328         } else {
 329             ether.setEtherType(EtherTypes.IPv4.shortValue());
 330             ether.setPayload(ip4Reply);
 331         }
 332         ether.setSourceMACAddress(getServerMacAddress(phyAddrees));
 333         ether.setDestinationMACAddress(etherPkt.getSourceMACAddress());
 334
 335         try {
 336             rawPkt = ether.serialize();
 337         } catch (PacketException e) {
 338             LOG.warn("Failed to serialize ethernet reply",e);
 339             return null;
 340         }
 341         return rawPkt;
 342     }
 343
 344     private byte[] getServerMacAddress(String phyAddress) {
 345         // Should we return ControllerMac instead?
 346         return DHCPUtils.strMacAddrtoByteArray(phyAddress);
 347     }
 348
 349     public short computeChecksum(byte[] inData, byte[] srcAddr, byte[] destAddr) {
 350         short checkSum = (short) 0;
 351         int sum = 0, carry = 0;
 352         int wordData, i;
 353
 354         for (i = 0; i < inData.length - 1; i = i + 2) {
 355             // Skip, if the current bytes are checkSum bytes
 356             wordData = ((inData[i] << 8) & 0xFF00) + (inData[i + 1] & 0xFF);
 357             sum = sum + wordData;
 358         }
 359
 360         if (i < inData.length) {
 361             wordData = ((inData[i] << 8) & 0xFF00) + (0 & 0xFF);
 362             sum = sum + wordData;
 363         }
 364
 365         for (i = 0; i < 4; i = i + 2) {
 366             wordData = ((srcAddr[i] << 8) & 0xFF00) + (srcAddr[i + 1] & 0xFF);
 367             sum = sum + wordData;
 368         }
 369
 370         for (i = 0; i < 4; i = i + 2) {
 371             wordData = ((destAddr[i] << 8) & 0xFF00) + (destAddr[i + 1] & 0xFF);
 372             sum = sum + wordData;
 373         }
 374         sum = sum + 17 + inData.length;
 375
 376         while((sum >> 16) != 0) {
 377             carry = (sum >> 16);
 378             sum = (sum & 0xFFFF)+ carry;
 379         }
 380         checkSum = (short) ~((short) sum & 0xFFFF);
 381         if(checkSum == 0) {
 382             checkSum = (short)0xffff;
 383         }
 384         return checkSum;
 385     }
 386
 387     private void setCommonOptions(DHCP pkt, DhcpInfo dhcpInfo) {
 388         pkt.setOptionInt(DHCPConstants.OPT_LEASE_TIME, dhcpMgr.getDhcpLeaseTime());
 389         if (dhcpMgr.getDhcpDefDomain() != null) {
 390             pkt.setOptionString(DHCPConstants.OPT_DOMAIN_NAME, dhcpMgr.getDhcpDefDomain());
 391         }
 392         if(dhcpMgr.getDhcpLeaseTime() > 0) {
 393             pkt.setOptionInt(DHCPConstants.OPT_REBINDING_TIME, dhcpMgr.getDhcpRebindingTime());
 394             pkt.setOptionInt(DHCPConstants.OPT_RENEWAL_TIME, dhcpMgr.getDhcpRenewalTime());
 395         }
 396         SubnetUtils util = null;
 397         SubnetInfo info = null;
 398         util = new SubnetUtils(dhcpInfo.getCidr());
 399         info = util.getInfo();
 400         String gwIp = dhcpInfo.getGatewayIp();
 401         List<String> dnServers = dhcpInfo.getDnsServers();
 402         try {
 403             /*
 404              * setParameterListOptions may have initialized some of these
 405              * options to maintain order. If we can't fill them, unset to avoid
 406              * sending wrong information in reply.
 407              */
 408             if (gwIp != null) {
 409                 pkt.setOptionInetAddr(DHCPConstants.OPT_SERVER_IDENTIFIER, gwIp);
 410                 pkt.setOptionInetAddr(DHCPConstants.OPT_ROUTERS, gwIp);
 411             } else {
 412                 pkt.unsetOption(DHCPConstants.OPT_SERVER_IDENTIFIER);
 413                 pkt.unsetOption(DHCPConstants.OPT_ROUTERS);
 414             }
 415             if (info != null) {
 416                 pkt.setOptionInetAddr(DHCPConstants.OPT_SUBNET_MASK, info.getNetmask());
 417                 pkt.setOptionInetAddr(DHCPConstants.OPT_BROADCAST_ADDRESS, info.getBroadcastAddress());
 418             } else {
 419                 pkt.unsetOption(DHCPConstants.OPT_SUBNET_MASK);
 420                 pkt.unsetOption(DHCPConstants.OPT_BROADCAST_ADDRESS);
 421             }
 422             if ((dnServers != null) && (dnServers.size() > 0)) {
 423                 pkt.setOptionStrAddrs(DHCPConstants.OPT_DOMAIN_NAME_SERVERS, dnServers);
 424             } else {
 425                 pkt.unsetOption(DHCPConstants.OPT_DOMAIN_NAME_SERVERS);
 426             }
 427         } catch (UnknownHostException e) {
 428             // TODO Auto-generated catch block
 429             e.printStackTrace();
 430         }
 431     }
 432
 433     private void setParameterListOptions(DHCP req, DHCP reply, DhcpInfo dhcpInfo) {
 434         byte[] paramList = req.getOptionBytes(DHCPConstants.OPT_PARAMETER_REQUEST_LIST);
 435         for(int i = 0; i < paramList.length; i++) {
 436             switch (paramList[i]) {
 437             case DHCPConstants.OPT_SUBNET_MASK:
 438             case DHCPConstants.OPT_ROUTERS:
 439             case DHCPConstants.OPT_SERVER_IDENTIFIER:
 440             case DHCPConstants.OPT_DOMAIN_NAME_SERVERS:
 441             case DHCPConstants.OPT_BROADCAST_ADDRESS:
 442             case DHCPConstants.OPT_LEASE_TIME:
 443             case DHCPConstants.OPT_RENEWAL_TIME:
 444             case DHCPConstants.OPT_REBINDING_TIME:
 445                 /* These values will be filled in setCommonOptions
 446                  * Setting these just to preserve order as
 447                  * specified in PARAMETER_REQUEST_LIST.
 448                  */
 449                 reply.setOptionInt(paramList[i], 0);
 450                 break;
 451             case DHCPConstants.OPT_DOMAIN_NAME:
 452                 reply.setOptionString(paramList[i], " ");
 453                 break;
 454             case DHCPConstants.OPT_CLASSLESS_ROUTE:
 455                 setOptionClasslessRoute(reply, dhcpInfo);
 456                 break;
 457             default:
 458                 LOG.debug("DHCP Option code {} not supported yet", paramList[i]);
 459                 break;
 460             }
 461         }
 462     }
 463     private void setOptionClasslessRoute(DHCP reply, DhcpInfo dhcpInfo) {
 464         List<HostRoutes> hostRoutes = dhcpInfo.getHostRoutes();
 465         if(hostRoutes == null) {
 466             //we can't set this option, so return
 467             return;
 468         }
 469         ByteArrayOutputStream result = new ByteArrayOutputStream();
 470         Iterator<HostRoutes> iter = hostRoutes.iterator();
 471         while(iter.hasNext()) {
 472             HostRoutes hostRoute = iter.next();
 473             if(hostRoute.getNexthop().getIpv4Address() == null ||
 474                 hostRoute.getDestination().getIpv4Prefix() == null ) {
 475                 // we only deal with IPv4 addresses
 476                 return;
 477             }
 478             String router = hostRoute.getNexthop().getIpv4Address().getValue();
 479             String dest = hostRoute.getDestination().getIpv4Prefix().getValue();
 480             try {
 481                 result.write(convertToClasslessRouteOption(dest, router));
 482             } catch (IOException | NullPointerException e) {
 483                 LOG.debug("Exception {}",e.getMessage());
 484             }
 485         }
 486         if (result.size() > 0) {
 487             reply.setOptionBytes(DHCPConstants.OPT_CLASSLESS_ROUTE , result.toByteArray());
 488         }
 489     }
 490
 491     protected byte[] convertToClasslessRouteOption(String dest, String router) {
 492         ByteArrayOutputStream bArr = new ByteArrayOutputStream();
 493         if((dest == null ||
 494                 router == null)) {
 495             return null;
 496         }
 497
 498         //get prefix
 499         Short prefix = null;
 500         String[] parts = dest.split("/");
 501         if (parts.length < 2) {
 502             prefix = new Short((short)0);
 503         } else {
 504             prefix = Short.valueOf(parts[1]);
 505         }
 506
 507         bArr.write(prefix.byteValue());
 508         SubnetUtils util = new SubnetUtils(dest);
 509         SubnetInfo info = util.getInfo();
 510         String strNetAddr = info.getNetworkAddress();
 511         try {
 512             byte[] netAddr = InetAddress.getByName(strNetAddr).getAddress();
 513           //Strip any trailing 0s from netAddr
 514             for(int i = 0; i < netAddr.length;i++) {
 515                 if(netAddr[i] != 0) {
 516                     bArr.write(netAddr,i,1);
 517                 }
 518             }
 519             bArr.write(InetAddress.getByName(router).getAddress());
 520         } catch (IOException e) {
 521             return null;
 522         }
 523         return bArr.toByteArray();
 524     }
 525
 526     private boolean isPktInReasonSendtoCtrl(Class<? extends PacketInReason> pktInReason) {
 527         return (pktInReason == SendToController.class);
 528     }
 529
 530     @Override
 531     public void close() throws Exception {
 532         // TODO Auto-generated method stub
 533     }
 534
 535     public void setPacketProcessingService(PacketProcessingService packetService) {
 536         this.pktService = packetService;
 537     }
 538
 539     public void setInterfaceManagerRpc(OdlInterfaceRpcService interfaceManagerRpc) {
 540         LOG.trace("Registered interfaceManager successfully");;
 541         this.interfaceManagerRpc = interfaceManagerRpc;
 542     }
 543
 544     private String getInterfaceNameFromTag(long portTag) {
 545         String interfaceName = null;
 546         GetInterfaceFromIfIndexInput input = new GetInterfaceFromIfIndexInputBuilder().setIfIndex(new Integer((int)portTag)).build();
 547         Future<RpcResult<GetInterfaceFromIfIndexOutput>> futureOutput = interfaceManagerRpc.getInterfaceFromIfIndex(input);
 548         try {
 549             GetInterfaceFromIfIndexOutput output = futureOutput.get().getResult();
 550             interfaceName = output.getInterfaceName();
 551         } catch (InterruptedException | ExecutionException e) {
 552             LOG.error("Error while retrieving the interfaceName from tag using getInterfaceFromIfIndex RPC");
 553         }
 554         LOG.trace("Returning interfaceName {} for tag {} form getInterfaceNameFromTag", interfaceName, portTag);
 555         return interfaceName;
 556     }
 557
 558     private org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.state.Interface getInterfaceStateFromOperDS(String interfaceName) {
 559         InstanceIdentifier<org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.state.Interface> ifStateId =
 560                 buildStateInterfaceId(interfaceName);
 561         Optional<org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.state.Interface> ifStateOptional =
 562                 MDSALUtil.read(LogicalDatastoreType.OPERATIONAL, ifStateId, dataBroker);
 563         if (!ifStateOptional.isPresent()) {
 564             return null;
 565         }
 566
 567         return ifStateOptional.get();
 568     }
 569
 570     private InstanceIdentifier<org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.state.Interface> buildStateInterfaceId(String interfaceName) {
 571         InstanceIdentifierBuilder<org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.state.Interface> idBuilder =
 572                 InstanceIdentifier.builder(InterfacesState.class)
 573                 .child(org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.state.Interface.class,
 574                         new org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.state.InterfaceKey(interfaceName));
 575         InstanceIdentifier<org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.state.Interface> id = idBuilder.build();
 576         return id;
 577     }
 578
 579     private List<Action> getEgressAction(String interfaceName, BigInteger tunnelId) {
 580         List<Action> actions = null;
 581         try {
 582             GetEgressActionsForInterfaceInputBuilder egressAction = new GetEgressActionsForInterfaceInputBuilder().setIntfName(interfaceName);
 583             if (tunnelId != null) {
 584                 egressAction.setTunnelKey(tunnelId.longValue());
 585             }
 586             Future<RpcResult<GetEgressActionsForInterfaceOutput>> result =
 587                     interfaceManagerRpc.getEgressActionsForInterface(egressAction.build());
 588             RpcResult<GetEgressActionsForInterfaceOutput> rpcResult = result.get();
 589             if(!rpcResult.isSuccessful()) {
 590                 LOG.warn("RPC Call to Get egress actions for interface {} returned with Errors {}", interfaceName, rpcResult.getErrors());
 591             } else {
 592                 actions = rpcResult.getResult().getAction();
 593             }
 594         } catch (InterruptedException | ExecutionException e) {
 595             LOG.warn("Exception when egress actions for interface {}", interfaceName, e);
 596         }
 597         return actions;
 598     }
 599
 600     private ImmutablePair<BigInteger, String> getDpnIdPhysicalAddressFromInterfaceName(String interfaceName) {
 601         ImmutablePair<BigInteger, String> pair = dhcpMgr.getInterfaceCache(interfaceName);
 602         if (pair!=null && pair.getLeft() != null && pair.getRight() != null) {
 603             return pair;
 604         }
 605         NodeConnectorId nodeConnectorId = null;
 606         org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.state.Interface interfaceState = getInterfaceStateFromOperDS(interfaceName);
 607         if(interfaceState != null) {
 608             List<String> ofportIds = interfaceState.getLowerLayerIf();
 609             nodeConnectorId = new NodeConnectorId(ofportIds.get(0));
 610         }
 611         BigInteger dpId = BigInteger.valueOf(MDSALUtil.getDpnIdFromPortName(nodeConnectorId));
 612         String phyAddress = interfaceState==null ? "":interfaceState.getPhysAddress().getValue();
 613         pair = new ImmutablePair<BigInteger, String>(dpId, phyAddress);
 614         dhcpMgr.updateInterfaceCache(interfaceName, pair);
 615         return pair;
 616     }
 617 }